5.8 L: Protection Functions
♦ L6: Torque Detection
The drive provides two independent torque detection functions that trigger an alarm or fault signal when the load is too
heavy (oL), or suddenly drops (UL). These functions are set up using the L6-D D parameters. Program the digital outputs
as shown below to indicate the underload or overload condition to an external device.
N O TICE:
D a m a g e to E qu ip m ent. Use th e Torque D e te c tio n fu n ctio n o f the drive to n o tify the P L C o f p o te n tia l o v e rc u rre n t o r o v e rlo a d
s itu a tio n s a t the lo a d p rio r to a drive o v e rlo a d fault. F a ilu re to c o m p ly m a y ca u se th e drive to fa u lt with a c o a s tin g m o to r a n d p o te n tia lly
d a m a g e equipm ent.
Note: W hen overtorque occurs in the application, the drive may stop due to overcurrent (oC) or overload (oL1). To prevent this, an
overload situation should be indicated to the controller before oC or oL1 occur in the drive. U se the torque detection for this
purpose.
H2-01 through H2-05 Setting
Description
B
Torque detection 1, N.O. (output closes when overload or underload is detected)
18
Torque detection 2, N.O. (output close w hen overload or underload is detected)
Figure 5.37
and
Figure 5.38
show the function o f overtorque and undertorque detection.
M o t o r c u r r e n t / t o r q u e
Note: 1. The torque detection function uses a hysteresis o f 10% o f the drive rated output current and m otor rated torque.
2. In V/f, the level is set as a percentage o f the drive rated output current. In OLV, CLV, and CLV/PM, it is set as a percentage o f the
m otor rated torque.
■ L6-01, L6-04: Torque Detection Selection 1, 2
The torque detection function is triggered when the current or torque exceeds the levels set in L6-02 and L6-05 for longer
than the time set in L6-03 and L6-06. L6-01 and L6-04 select the conditions for detection and the operation that follows.
No.
Name
Setting Range
Default
L6-01
Torque Detection Selection 1
0 to 8
0
L 6-04
Torque Detection Selection 2
0 to 8
0
Setting 0: Disabled
Setting 1: oL3, oL4 at speed agree (Alarm)
Overtorque detection is active only when the output speed is equal to the speed reference, i.e., no detection during
acceleration and deceleration. The operation continues after detection and an oL3/oL4 alarm is triggered.
Setting 2: oL3, oL4 at run (Alarm)
Overtorque detection works as long as the Up/Down command is active. The operation continues after detection and an
oL3 or oL4 alarm is triggered.
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual